problems importing into a branch

[Andy Dean]

I am having problems using cvs import to import onto an existing branch. I 
am trying to update a module with import, similar to the operation 
described on p73 of the "Cederqvist" document.  I actually want the import 
to work on a branch, though it seems to end up always updating the files on 
the main trunk, which is initially loaded with a similar input.  I think I 
am confused between the branch tags and the vendor tags required by the cvs 
import command.  Anybody have a clear explanation of how to do this operation?

(I am trying to stuff an existing system into CVS.  First I import the 
current production code, then I create a branch for development.  I want to 
import the existing development code to update the development 
branch.  After some additional changes I plan to merge the development 
branch back to the main trunk.)

Thanks for any help.

Andy